The shell bone script of character Five is
There are many explanations on what the above X means, most are too complicated and confusing. The only one I think is the most reasonable is that there are four end points and one cross point in the X, total five the most important points.
The bronze script of character Five is
Two horizontal lines connected on the top and bottom points, making five nodes. Ancient Chinese records things by tying knots, here is five knots to represent number Five.
The big seal script of the character is
The small seal script of the character is
Same as the clerical script.
The pinyin for character Five is Wu3.